Pile-driver hammer.



J. A. MONROE.

FILE DRIVER HAMMER.

APPLICATION FILBDMAY 12, 1913.

Patented Jan.20,1914.

un/humus JOSEPH A. MONROE, 0F MAYGER, OREGON.

FILE-DRIVER HAMMER.

Specification of Letters Patent.

Patented Jan. 20, 1914-.

Application filed May 12, 1913. Serial No. 767,237.

To all whom it may concern Be it known that I, JOSEPH A. MONROE, a citizen of the United States, resident of Mayger, in the county of Columbia and State of Oregon, have made a certain new and useful Invention in Pile-Driver Hammers; and I declare the following to be a full, clear, and exact description of the same, such as will enable others skilled in the art to which it appertains to make and use the invention, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specification.

Figure 1 is a side view of the device. Fig. 2 is a central vertical section of the same. Fig. 3 is a bottom plan view of the hammer.

The invent-ion has for its object to improve the pile driving devices for which Letters Patent No. 551,989 were granted to me on the 24th day of December, 1895.

The invention consists in the novel construction and combinations of parts as hereinafter set forth and claimed.

In the accompanying drawings, illustrating the invention,the numeral 2,indicates an upright frame, having lateral guides 8, for the follower 4, and hammer 5. Usually the follower and hammer are connected by means of chains or ropes 6.

The hammer is made as usual of iron, with lateral guides 16, but is formed with a conical socket or recess 7, extending vertically upward in its lower end portion, such recess terminating in a point or apex 8. This conical recess is designed to have sides 9, of relative low angular inclination, the opening or margin of the socket being usually 20 inches in diameter, and its height about 10 inches. The angular inclination of the conical hammer or reces is therefore about ninety degrees. The follower 4:, is also provided with lateral guides 17 and in its lower portion with a similar low angle conical recess 13, and its top is made with a marginal wall 14,

in which is designed to be fitted a removable impact block 15, having a conical top portion 16, adapted to fit the interior or inside surface of the recess 7, of the hammer. This conical top is, therefore, of low angular inclination from its apex, and is so designed in order to provide for its easy release from the hammer recess.

In the operation of these devices, the follower is designed to be let down upon the head of the pile, and because of the broad conical form of its recess, it incloses the upper end of the pile in such manner as to prevent it from undue spreading. No chamfering is required. WVhen the hammer is tripped and falls it is designed to strike the conical top of the impact block, which is of suificient vertical height to prevent the metallic bottom of the hammer from striking the metallic top of the follower. The angular conical form of the top of the impact block is designed not only to avoid cushioning with air between the block and the hammer, and the consequent rebound or resilient effect, but also because of the low apex angle, to provide for a ready release of the hammer recess from the block, when the hammer is to be lifted for another stroke. These features are designed to facilitate the operation of this pile driver very materially.

What I claim is:

In a pile driver a hammer having lateral guides and in its lower end a broad vertical cone recess having an angular spread from its apex of about twice its height, a follower, and, seated in the top of said follower, a re movable block having a vertical cone top, the opposite sides of which are substantially at right angles to each other.

In testimony whereof I affix my signature, in presence of two witnesses.

JOSEPH A. MONROE.

Witnesses:

F. A. POMEROY, D. E. HILLSBERY.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

